I have owned a few ... and installed good many more for friends.
Good power with a warranty ...

As a general rule ... you cannot rebuild ( and do the job right ) a engine with that power and reliability for that much money. The only complaint I have is they do not sound TOUGH .. they idle fairly calmly. I much prefer the ZZZ and the ZZ1 over the ZZ4. I have the " Hot Cam " option installed and it is kind of mild ...

Thanks. That is the kind of information I was looking for. I'm looking for something with a little "thump" to it myself. For me, the sound of an engine is just as important as the performance.